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Bulletin H-IM-71A
Part No. 4346B001
August 2002
(Replaces H-IM-71, August 1996)
Air Handler Unit
Installation & Operations Manual
TABLE OF CONTENTS
Coil Stacking ........................................................................................ 5
Condensate Drain Traps ....................................................................... 4
Direct Expansion Coils ......................................................................... 3
Filter Quantities .................................................................................... 8
Freezing Temperatures ........................................................................ 6
Inspection ............................................................................................ 2
Installation ........................................................................................... 2
Internal Isolation .................................................................................. 4
Maintenance ........................................................................................ 4
Motors & Drives ................................................................................... 2
Replacement Parts ............................................................................... 8
Section Assembly ................................................................................. 5
Shipment of Sections ........................................................................... 7
Start-up ................................................................................................ 4
Steam Coils ........................................................................................... 2, 3
Water Coils ........................................................................................... 3
Weights ................................................................................................ 7
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Table of Contents
Summary of Contents for Heatcraft Refrigeration Products 4346B001
- Page 1 Bulletin H-IM-71A Part No. 4346B001 August 2002 (Replaces H-IM-71, August 1996) Air Handler Unit Installation & Operations Manual TABLE OF CONTENTS Coil Stacking ... 5 Condensate Drain Traps ... 4 Direct Expansion Coils ... 3 Filter Quantities ... 8 Freezing Temperatures ... 6 Inspection ...
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Page 2: Suspended Units
Inspection Shipment should be checked against the bill of lading to verify that all items listed have been received. All parts should be carefully inspected to determine if any damage was incurred in shipment. Any shortage and/or claims for damage should be immediately reported to the delivering carrier followed by filling a claim for shortages and/or damages. -
Page 3: Water Piping
When two or more steam coils are furnished in a unit, provide separate traps for each coil. Size traps with ample capacity using the maximum heating load and service factor recommended b y the trap manufacturer. Select control valves in accordance with the recommendations of the control manufacturer using actual heating loads. -
Page 4: Maintenance
Check for proper rotation of the blower pulley. Three phase motor rotation can be reversed by exchanging two of the three leads at the motor starter. The rotation of single phase motors can be reversed by exchanging leads inside the motor junction box. - Page 5 Typical ‘Accessory-to-Coil-Section’ and ‘Accessory-to-Accessory’ Attaching Method...
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Page 6: Freezing Temperatures
The blower should be operated until no moisture can be detected leaving the coil. Then, shut the blower off and permit the coil to stand for a few minutes. This will permit the moisture that has adhered to the walls to accumulate. Then the blowing out operation should be repeated. -
Page 7: Weights
Air Handler Component Section Model ID Description Fan Short Short Long Long Vertical Heating Duty FC Heating Duty AF Fan Only Fan Only Flat -TA & Pleated 2” Flat -Permanent 2” Flat -Pleated 4” High Capacity -TA & Pleated High Capacity -Permanent High Efficiency- 21”... -
Page 8: Replacement Parts
12 FC 18” Med Pressure Note: For sizes 03-12, it is less expensive to replace the blower assembly than to replace the blower wheel. Blower assembly also includes bearings and shaft 14-41, Forward Curved Unit size, Fan Diameter, Type 14 FC 20”...